A pothole starts where water sits, or where the base was never packed. Fill the hole with the same angular stone and compact it. Then fix the water. A crown down the middle sends rain to the edges, and open ditches give that water somewhere to go. If mud is pumping up through the rock, the geotextile or the base has failed, and a fresh sprinkle of stone will not hold.
Washouts and erosion take the edges first, especially on a slope. Rake stone back into the thin spots after a hard rain, and keep the surface from funneling water into one rut. Plan on about an inch of fresh gravel every year or two. That replaces what tires and rain carry off.
Snow is fine on gravel if the plow blade stays up about an inch. A blade set on the ground peels the surface off and piles it in the grass. A snowblower does less damage. After the thaw, fill the stripes the plow scraped.
The driver drops the load where you point. Spreading and compacting are on you, unless the hauler quotes that work on site. When a stretch gets thin, see your delivered price and order the same stone again.